ag-gipp/GoUldI

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        <mrow class="MJX-TeXAtom-ORD">
          <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="1" data-semantic-parent="2">k</mi>
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      <mo data-semantic-type="punctuation" data-semantic-role="application" data-semantic-id="7" data-semantic-parent="8" data-semantic-added="true" data-semantic-operator="appl">⁡</mo>
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        <mo stretchy="false" data-semantic-type="fence" data-semantic-role="open" data-semantic-id="3" data-semantic-parent="6" data-semantic-operator="fenced">[</mo>
        <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="4" data-semantic-parent="6">n</mi>
        <mo stretchy="false" data-semantic-type="fence" data-semantic-role="close" data-semantic-id="5" data-semantic-parent="6" data-semantic-operator="fenced">]</mo>
      </mrow>
    </mrow>
    <annotation encoding="application/x-tex">y_{k}[n]</annotation>
  </semantics>
</math>